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By T. Perry, M. Cecava
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Extra info for Beef Cattle Feeding and Nutrition
National Research Council (1984). "Nutrient Requirements of Beef Cattle," 6th rev. ed. Natl. Acad. , Washington, DC. Perry, T. , Bums, R. , Mohler, M. , and Beeson, W. M. (1957). Mixed supplements versus References 35 soybean meal for fattening cattle self-fed ground ear corn. Purdue Univ. Agric. Exp. Sta. Mimeo AS-201. Perry, T. , Beeson, W. , Mohler, M. , and Smith, W. H. (1962). Levels of supplemental vitamin A with or without sun-cured alfalfa meal for fattening steer calves. J. Anim. Sci. 21,333.
Thus, any interference with thrombin formation, for example, will in turn slow down blood clotting. Vitamin K is quite prevalent in nature, especially in green leaves; it occurs abundantly in seeds, and much less abundantly in fruits and roots. Vitamin K is synthesized in the rumen. However, the problem that might exist relative to vitamin K adequacy in cattle nutrition is the matter of an anti-vitamin K substance known as dicumarol. Spoiled sweet clover contains dicumarol which, when consumed, serves as an anti-metabolite, blocking the action of vitamin K in forming prothrombin.
With minor exceptions, sulfide is probably the central metabolite in rumen sulfur metabolism. Sulfur is incorporated into cystine, cysteine, and methionine by the ruminal microbes. If sulfur levels are inadequate, total protein synthesis is decreased. The known conditions of ruminal sulfur metabolism, allowing for losses from the system and the direct requirements for the microorganisms, give general support to the suggestion that the dietary nitrogen to sulfur ratio should be about 10:1. This appears to be more critical when diets contain appreciable amounts of nitrogen from urea, which contributes nitrogen but not sulfur to the diet.
Beef Cattle Feeding and Nutrition by T. Perry, M. Cecava